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US 5,812,286 AGranted
Automatic color processing to correct hue shift and incorrect exposure
AssigneeHewlett-Packard Company
InventorQian Lin
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Abstract
A digital color processing method for images from scanners and digital cameras processes image data suitable for display on monitors or color hardcopies produced by digital color printers and correct hue shift and incorrect exposure based on the image content. The method automatically corrects the data based on the histogram of the acquired image normalizing the image data to correct for the hue shift and determining the gamma parameter to correct the exposure of the image.
Claims9
A digital color processing method for image data points from scanners and digital cameras for each channel, comprising the steps of:
- gathering image pixels;
- determining a first difference between a light intensity minima "BLACK" and maxima "WHITE";
- determining a second difference between the image data pixel and the light intensity minima for the channel;
- determining a normalized image data pixel that is a ratio of the first and second differences,
- correcting exposure of the image pixels;
- mapping each normalized image pixel according to the exposure;
- and
- imprint the mapped normalized image pixel.
5 more elements
Dependencies are inferred from the claim text.